Convenient synthesis of 5-alkylidene-2(5H)-furanones,2(5H)-furanones and 2-ethoxyfurans
作者:R.W. Saalfrank、W. Hafner、J. Markmann、H.-J. Bestmann
DOI:10.1016/s0040-4020(01)86013-0
日期:1988.1
the orthoesters are prepared. can be hydrolyzed under acidic conditions to give 5-alkylidene-2(5H)-furanones . Reaction of 1,2-hydroxyketones and (2,2-diethoxyvinylidene)triphenyl-phosphorane (2) via Michael addition and Wittig reaction yields orthoesters , which can be hydrolyzed to give 2(5H)-furanones and 2-ethoxyfurans respectively.
从烯化1,2-二酮和(2,2-二乙氧基亚乙烯基)三苯基膦()或从(2,2-二乙氧基乙烯基)三苯基phenyl四氟硼酸酯()烯化开始,制备原酸酯。可以在酸性条件下水解,得到5-亚烷基-2(5H)-呋喃酮。1,2-羟基酮与(2,2-二乙氧基亚乙烯基)三苯基-膦烷(2)的反应通过Michael加成反应和Wittig反应生成原酸酯,可以将其水解生成2(5H)-呋喃酮和2-乙氧基呋喃。